won't stand for it
(Usually I): won't allow it (whatever that it may be, and however one defines whatever it is they won't allow).
Example:
boy a) I'll borrow money from your parents, Andrew, to play poker with some buddies.
Andrew : I am sick and tired of supporting your stupid poker habit. I have decided on my parents' behalf that i won't stand for it that you borrow money from them. go get a better paying job.
boy a) I'll borrow money from your parents, Andrew, to play poker with some buddies.
Andrew : I am sick and tired of supporting your stupid poker habit. I have decided on my parents' behalf that i won't stand for it that you borrow money from them. go get a better paying job.